Deck 10: Sewers Sewage Disposal Methods

Question 1

The total length of the trench required in a leaching field is determined by

A) effluent quality and the ability of the soil to absorb water from the drain pipes.
B) code requirements.
C) the amount of effluent predicted to be conveyed into the leaching field in a 24-hour period.
D) the results of the percolation test.

Answer 1

A

Question 2

Anaerobic processes

A) occur when oxygen is deficient.
B) occur in oxygen-rich sewage.
C) do not involve odors.
D) are faster than aerobic processes.

Answer 2

A

Question 3

For residential applications, septic tank size is selected based on

A) the number of bathrooms in the building.
B) the estimated number of occupants in the building.
C) the estimated number of hours per day the building is in use.
D) the number of bedrooms in the building.

Answer 3

D

Question 4

The outlet of a septic tank should be located 2 inches to 4 inches below the inlet elevation.

Question 5

The six steps in public water treatment processes are:

A) primary, settling, processing, secondary settling, filtration, and contamination.
B) primary, settling, aeration, filtration, chlorination, and pumping.
C) primary, settling, aeration, secondary settling, filtration, and chlorination.
D) settling, aeration, secondary settling, tertiary settling, filtration, and chlorination.

Question 6

At least 50' should be between any well and the septic tank or any part of the disposal field.

Question 7

Sewer pipe should be uniformly supported on undisturbed earth.

Question 8

Cleanouts are required by most codes at

A) the connection of the building drain and at specified intervals along the sewer line.
B) the connection of the building drain only.
C) specified intervals along the sewer line and at the septic tank.
D) anywhere along the sewer line.

Question 9

The minimum septic tank size should be equal to the volume of sewage discharged from the building in 24 hours.

Question 10

Private sewage disposal systems are used for

A) any building that cannot be connected to a public system.
B) residential housing only.
C) back-up for a public system that is overused.
D) commercial buildings only.

Question 11

What is the first consideration when sizing a septic system?

A) the amount of sewage flow per 24-hour period
B) the size of the septic tank
C) the size of the drainage lines in the leaching fields
D) the size of the seepage pit

Question 12

A septic tank is a watertight vessel that receives sewage from a building.

Question 13

Which of these processes occurs last in the public sewage treatment process?

A) settling
B) primary
C) chlorination
D) filtration

Question 14

The materials in sewage that are inactive solids (and will not become liquids) are called

A) fungi.
B) sludge.
C) effluent.
D) mud.

Question 15

The slope of the building sewer (sizes through 6 inches) should not be less than 1/8 inch per foot.

Question 16

The building sewer is located inside the building.

Question 17

Sewage is

A) the process of breaking down waste.
B) liquid-borne undesirable or questionable material.
C) only organic waste materials.
D) only inorganic waste materials.

Question 18

The building sewer begins where the sewer line leaves the property.

Question 19

Septic tanks should be installed as deep as possible to ensure satisfactory performance.

Question 20

Organic materials are

A) carbon-based compounds.
B) broken down by bacterial action.
C) subject to change and give rise to gases and other chemicals.
D) all of the above.

Question 21

A thrust block is used to

A) force water to travel against gravity.
B) offset internal forces that can separate joints.
C) hold piping in its proper place in an interior wall.
D) block the flow of water in a pipe.

Question 22

Using Table 10-1 in the textbook, a 4" diameter pipe can discharge ____________________ gallons per minute with a slope of 1/4" per foot.

Question 23

Using Table 10-1 in the textbook, a 4" diameter pipe can discharge ____________________ gallons per minute with a slope of 1/8" per foot?

Question 24

If a thrust block calculation dictates that the required area be equal to 9 square feet, what must be the length of the sides if the thrust block is a square?